Chemistry
Alcoholic (– OH) group can be identified by :

Esterification Test
FeCl3Test
Tollen's Reagent Test
Ozonolysis Reaction

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Chemistry
Water is not effective in extinguishing a fire caused by petrol because

Water and petrol are miscible with each other
Water and petrol react chemically
The flame is too hot for water to cool it down
Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn

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